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<p>The photocatalytic efficiency of lead-free Bi-based halide perovskites, such as Cs<sub>3</sub>Bi<sub>2</sub>X<sub>9</sub> (X = Br, I) for CO<sub>2</sub> reduction is often hindered by self-aggregation and insufficient oxidation ability. In this work, a visible-light-driven (<i>λ</i> &gt; 420 nm) Z-scheme heterojunction photocatalyst composed of 0D Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub> nanoparticles on 1D WO<sub>3</sub> nanorods for photocatalytic CO<sub>2</sub> reduction and water oxidation is synthesized using an <i>in situ</i> growing approach. The resulting 0D/1D Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>/WO<sub>3</sub> Z-scheme heterojunction photocatalyst exhibits a visible-light-driven photocatalytic CO<sub>2</sub> reduction performance for selective CO production, achieving a selectivity of 98.7% and a high rate of 16.5 (µmol/(g·h), approximately three times that of pristine Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>. Furthermore, it demonstrates decent stability in the gas-solid photocatalytic CO<sub>2</sub> reduction system. The improved performance of Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>/WO<sub>3</sub> is attributed to the formation of the 0D/1D Z-scheme heterojunction, which facilitates charge transfer, reduces charge recombination, and maintains the active sites of both 0D Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub> for CO<sub>2</sub> reduction and 1D WO<sub>3</sub> for water oxidation. This work provides valuable insights into the potential of morphological engineering and the design of simultaneous Z-scheme heterojunction for lead-free halide perovskites.</p>

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In situ construction of Cs3Bi2I9/WO3 0D/1D Z-scheme heterojunction photocatalyst for photochemical CO2 reduction under visible light

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Yan Ding,
  • Yihao Zhang,
  • Fei Zhang,
  • Pei Tian,
  • Yiduo Wang,
  • Shaohua Shen,
  • Jinjia Wei,
  • Jie Chen

摘要

The photocatalytic efficiency of lead-free Bi-based halide perovskites, such as Cs3Bi2X9 (X = Br, I) for CO2 reduction is often hindered by self-aggregation and insufficient oxidation ability. In this work, a visible-light-driven (λ > 420 nm) Z-scheme heterojunction photocatalyst composed of 0D Cs3Bi2I9 nanoparticles on 1D WO3 nanorods for photocatalytic CO2 reduction and water oxidation is synthesized using an in situ growing approach. The resulting 0D/1D Cs3Bi2I9/WO3 Z-scheme heterojunction photocatalyst exhibits a visible-light-driven photocatalytic CO2 reduction performance for selective CO production, achieving a selectivity of 98.7% and a high rate of 16.5 (µmol/(g·h), approximately three times that of pristine Cs3Bi2I9. Furthermore, it demonstrates decent stability in the gas-solid photocatalytic CO2 reduction system. The improved performance of Cs3Bi2I9/WO3 is attributed to the formation of the 0D/1D Z-scheme heterojunction, which facilitates charge transfer, reduces charge recombination, and maintains the active sites of both 0D Cs3Bi2I9 for CO2 reduction and 1D WO3 for water oxidation. This work provides valuable insights into the potential of morphological engineering and the design of simultaneous Z-scheme heterojunction for lead-free halide perovskites.